Did you know that you can find the world's longest animal on the shore? This is the bootlace worm (Lineus longissimus), which can grow up to 60 metres in length.
Did you know that there are about 35 grams of salt per litre of seawater? This gives a salinity (salt content) of 3.5%.
Did you know that brown crabs are often white when they measure less than 15mm?
Did you know that the hardest biological material on Earth is a combination of protein and the mineral goethite? This combination of substances can for example be found in the teeth of the common limpet. You can find out more the common limpet elsewhere on this website.
Did you know that blue whales eat up to 40 million krill every single day?